RWRandGenR250

Module:  Essential Math   Group:  Statistics classes

Does not inherit

• Local Index
• Synopsis
• Description
• Public Constructors
• Public Member Functions
• Public Member Operators
• Related Global Operator

Members

long seed() operator!=() operator()

operator=() operator==() printOn()

restart() restoreFrom() RWRandGenR250()

saveOn() scanFrom()

Non-Members

operator>>()

operator<<()

#include <rw/randr250.h>
RWRandGenR250 gen;

Class RWRandGenR250 generates random numbers uniformly distributed over the interval [0, 1], and may be used instead of class RWRandGenerator as a template parameter to any of the distribution generators derived from abstract base class RWTRand<>. RWRandGenR250 is a generalized feedback shift register generator.

Unlike class RWRandGenerator, each instance of RWRandGenR250 contains and maintains its own, independent state. This can make it easier to use in some situations. The "internal state" of an instance of RWRandGenR250 consists of a seed, an array of unsigned longs known as the "state vector" and an integer index into that state vector. (S. Kirkpatrick and E. Stoll, Journal of Computational Physics, 40, p. 517 (1981).

RWRandGenR250();

Constructs a generator, abitrarily seeded by a call to the time() function.

RWRandGenR250(const RWRandGenR250& x);

Constructs a copy of x. The copy's state will equal x's state at the time the copy is created, but will not share x's state.

RWRandGenR250(unsigned long seed);

Constructs a generator with a specified seed.

unsigned 
long seed() const;

Returns the seed used to initialize the generator.

void 
restart();

Restarts the generator, abitrarily seeding it by a call to the time function.

void 
restart(unsigned long seed);

Restarts the generator with specified seed.

double 
operator()();

Returns a random double in [0,1].

void 
operator=(const RWRandGenR250& x);

Sets an instance of RWRandGenR250 equal to the state of instance x.

bool 
operator==(const RWRandGenR250& x) const;

Returns true for two distinct instances of RWRandGenR250 if they will return identical sequences of values.

bool 
operator!=(const RWRandGenR250& x) const;

Returns true for two distinct instances of RWRandGenR250 if their interal states differ. "(x != x)" returns false.

vvoid 
printOn(std::ostream& s) const; 

Outputs a summary of self's internal state on ostream s.

void 
scanFrom(std::istream& s);

Inputs an internal state from istream s to self.

void 
restoreFrom(RWvistream&);
void 
restoreFrom(RWFile&);

Restores internal state of self from a virtual stream or an RWFile.

void 
saveOn(RWvostream&) const;
void 
saveOn(RWFile&) const;

Stores internal state of self to a virtual stream or in a binary format to an RWFile or RWvostream.

std::ostream& rwmathexport
operator<< (std::ostream& s, const RWRandGenR250& rgen);

Outputs a summary of rgen's internal state on ostream s.

std::istream& rwmathexport
operator>> (std::istream& s, RWRandGenR250& rgen);

Inputs an internal state from istream s to rgen.

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